Monthly Archives: November 2016

This board is one of the first boards I’ve done for the monsputer. It has only TTL logic on it. I’ve probably made it about 25 years ago (or more!). The chips came from a bunch of PCBs that I … Continue reading →

A board that I made previously took too much glue logic and a multiplexing circuit was not working well enough so I decided to redo this board. 2 x 6850 UARTs with 8253 counter for baud rates 6840 Timer/Counter Dallas … Continue reading →

CPLDs allows for shrinking the number of chips needed for glue logic and more advanced functions. Nowadays, for programming the CPLD from Atmel, you need a USB to JTAG adapter and the WinCUPL, Atmel ISP softwares. There is also a … Continue reading →